Hello guys! I'd like to make a new mob and I want it so that you have to put some blocks down in a specific shape and the mob spawns when placing the Pumpkin (Yes, my mob has a pumpkin as a head ). I already looked at several source codes and I searched the vanilla one for solutions but I couldn't find anything. Can you please help me out?

I believe that the code for that is in the pumpkin block.

 

So to do what you wanted. You would need to have your block detect the shape you want via onNeighbourBlock method.

Thank you so far. But how can I add my Golems to the "Awake-List" without editing BlockPumpkin.java?

"Awake-List"? What do you mean by that?

 

Do you mean how to actually spawn it into the world? Because that's the only thing I can make out of that

Exactly.

Well that is fairly easy.

 

public void onNeighbourBlockChange(parameters....) {
    boolean isShape = world.getBlockID(x, y, z); // check all the blocks that you want to be in your shape. 

    if (isShape) {
        EntityToSpawn entity = new EntityToSpawn(world);
        entity.setPosition(x, y, z); // something like that
        world.spawnEntity(entity);
    }
}

But that is for a custom Block - I'd like it for the vanilla pumpkin. And without editing the base class...

Use PlayerInteractEvent to catch the right click action. Check if player has a block in hand which is a pumpkin...